Analysis of the Transferability of the Systematic Error of Pressure Measurement Films Under Hertzian Conditions to Wheel-Rail Normal Contact

接触体是机械工程中众多机械元件的基础，在许多应用中对功能和安全要求起着至关重要的作用。这种说法尤其适用于传统的轨道车辆，因为轮轨接触面是车辆和轨道之间唯一的机械界面，它对支撑、引导、驱动和制动力起作用。因此，需要对接触贴片的形状和尺寸以及其应力和应变状态有充分的了解。虽然计算机辅助计算可以很好地了解所得接触面的性质，但没有适当的实验验证，这些计算并不是决定性的。然而，目前还没有一种确定轮轨接触面的实验方法。然而，根据申请人现任和前任主席长期积累的知识，可以声明，只要已知系统测量误差，使用市售压力测量膜进行实验接触面表征是很有可能的。在这个项目的背景下，压力测量膜的测量误差的可转移性，这只被确定为可解析计算的物体，对实际轮轨法向接触进行了研究。根据另一个项目的研究结果，现有薄膜模型的材料参数将通过实验设计进行调整，以重现已知的系统偏差。之后，这些膜模型将在数值轮轨模型中实现。然后，通过与实际轮-轨-廓线组合的实验观察结果进行比较，验证从该情景模拟中获得的接触面。

Contact bodies represent the basis of numerous machine elements in mechanical engineering and play a critical role regarding functional and often safety requirements in several applications. This statement applies especially to conventional rail vehicles, since the wheel-rail contact surface is the only mechanical interface between vehicle and track, which reacts support, guiding, driving and braking forces. A sound knowledge of the shape and dimensions of the contact patch, as well as its stress and strain state, is hence required. Although computer-aided calculations provide a good insight into the properties of the resulting contact surface, these are not conclusive without appropriate experimental validation. However, no method for the experimental determination of wheel-rail contact surfaces has established itself yet.Nevertheless, based on the long-standing knowledge acquired at the current and previous chair of the applicant, it can be stated that using commercially available pressure measuring film is a serious possibility for experimental contact surface characterization, provided that the systematic measurement error is known.In the context of this project, the transferability of the measurement error of pressure measurement films, which has only been determined for analytically computable bodies, to the actual wheel-rail normal contact is to be investigated. Based on the findings of another project, the material parameters of existing film models are to be adjusted by means of design of experiments in order to reproduce the known systematic deviation. Later, these film models shall be implemented in numerical wheel-rail models. The contact surfaces obtained from the simulation of this scenario are then to be validated by comparison with experimental observations with actual wheel-rail-profile combinations.